Across:
8 Remove (RIP OUT) Border (rim) briefly (m) (‘rim’ without ‘m’ = RI-) in 24 across similarly (‘mope’ is similar to pout = -P OUT) (RIP OUT),
9 Heavenly (ETHEREAL) type at foundation (‘typE’ at foundation = E-) gets their (their) report (= homophone indicator) (‘their’ = ‘there’ = THERE-) on American (-A-) city (LA) back (LA = -AL) (ETHEREAL),
10 The missing part of Hamlet’s (‘the’ missing part of/missing from ‘Hamlets’ = amls = SLAM) forceful putdown? (forceful put down = SLAM down),
11 Wellington (Wellington BOOT-) on the French (‘the’ = -LE-) horse (-GG-) leading English (leading ‘English’ = -E-) regiment (-R) (BOOTLEGGER) is not lacking in spirit, the unofficial type (BOOTLEGGER),
12 Reset (reset) switch (= anagram indicator) (reset = STERE-) for old (-O) (STEREO) music system (STEREO),
14 Freedom of movement (LATITUDE) in US city (LA-) for flighty type (-TIT-) heading off (d) with guy (dude) (‘dude’ = -UDE) (LATITUDE),
15 The people (COMMUNITY) find recent (recent = CENTRE) changes (= anagram indicator) (COMMUNITY CENTRE) preferable for the local gathering (COMMUNITY CENTRE),
18 Remove the impurities (FILTRATE) by opening Tequila (opening ‘Tequila’ = -T-) into a trifle (a trifle) mix (= anagram indicator) (a trifle = FILTRA-E) (FILTRATE),
20 For those taking steps (LADDER) to take head off (b) inflated type blown-up in football? (bladder) (‘bladder’ without ‘b’ = LADDER),
22 Vehicle (bus) cutbacks (= reverse indicator) (bus = SUB-) to make a difference (-ALTER-) at school (National School = -NS) (SUBALTERNS) for junior military officers (SUBALTERNS),
24 Bank’s money for old rope (banks ‘MOney for old roPE’ = MOPE) produced by pessimist (MOPE),
25 Run through (PRACTISE) the doctor’s business (practice), in a manner of speaking! (= homophone indicator) (‘practice’ = ‘PRACTISE’),
26 Tip off (p) Pat (‘Pat’ without ‘p’ = AT-), Spike (spike/nail = -TACK) (ATTACK) and Sally (sally/raid = ATTACK).
Down:
1 Unfinished (a) instrument (viola) (‘viola’ without ‘a’ = VIOL-) has bearing (bearing/direction = East = -E-) on time (-T) (VIOLET) in the garden (VIOLET),
2 Mexican hyssop raised (= reverse indicator) on the borders (‘MExican hyssOP’ raised on the borders = meop = POEM) in Limerick (POEM),
3 Uncompromising (STUBBORN) Top Secret (top ‘Secret’ = S-) Review (= reverse indicator) nevertheless (but = -TUB-) delivered (-BORN) (STUBBORN),
4 Flick over (= reverse indicator) welcome mat concealing (concealed by ‘welcOME Mat’ = omem = MEMO) note (MEMO),
5 Lodge (CHALET) in church (CH-) academy (-A-) has rented accommodation (-LET) (CHALET),
6 Extremely worried (FRIGHTENED) by freight (freight = FRIGHTE-) travelling (= anagram indicator) with leads, nitrates, explosives, dynamite (leads/first letters of ‘Nitrates, Explosives, Dynamite’ = -NED) (FRIGHTENED),
7 No boating in Botanical Garden (no ‘boating’ in ‘Botanical Garden’ = calarden = CALENDAR) where some people go for their dates (CALENDAR),
13 Payment (REMITTANCE) for martinet (martinet = REMITTAN-) working (= anagram indicator) with Church (Church of England = -CE) (REMITTANCE),
14 Drink (LATTE) consumed by Michael Attenborough (consumed by ‘MichaeL ATTEnborough’ = LATTE),
16 It’s said in passing (OBITUARY) for notice (death notice = OBITUARY),
17 Two officers (Col +DS- = COLD S-) taking short time out (-NAP) (COLD SNAP) as forecasted by those who know which way the wind is blowing (COLD SNAP),
19 Realise (ATTAIN) a (A-) temperature (-T-) ain’t (aint) problematic (= anagram indicator) (aint = -TAIN) (ATTAIN),
21 Anticipate (EXPECT) former (EX-) boxer (boxer dog/pet = -PE-T) grabbing head of champ (head of ‘Champ’ = -C-) (EXPECT),
23 Upsets (= reverse indicator) vocal (= homophone indicator) Shakespearean character (‘Lear’ = ‘leer’ = REEL) in turn (REEL),
24 Bit of gloomy thought (bit of ‘glooMY THought’ = MYTH) in allegory (MYTH).